Milking machine teat cup



Aug. 28, 1934. w. A. scoTT MILKING MACHINE TEAT CUP Filed March 19. 1932 2 Sheets-Sheet l W/TNESS:

Aug. 28, 1934.

MILKING Filed A. SCOTT MACHINE TEAT CUP March 19, 1932 2 Sheets-Shea?l 2 Patented Aug.12s,1934 1,9%,467

1,971,467 MILKING MACHINE TEAT CUP Walter A. Scott, Poughkeepsie, N. Y., assignorto The De Laval Separator Company, New York, N. Y., a corporation of New Jersey Application March `19, 1932, Serial No. 599,911

3 Claims. (Cl. 31-85) The object ci my invention `is `to substantially ring f, the upper end of which engages the shell a increase the efficiency of a double chambered teat and the lower end of which extends under an excup for milking machines and at the same time ternal annular flange on the upper end or" shell b. automatically maintain the inner flexible and The outer shell b at its, lower end is contracted i elastic liner under proper tension notwithstandto form a neck y. The inner rubber linerh is 60 ing the stretching of the same due to continued stretched and expanded at its upper end and there use. i held within the expanded upper end oi' the inner It is a well known characteristic of a rubber shell aby means of an internal ring i. The lower teat cup liner that, due to the pneumatic pulsaend of the rubber liner is bent outward and uplll tions to which it is subjected and to the tendency Ward over the lower end ci the neck g of the outer 65 of rubber to more or less deteriorate with dimishell b. nution of its elasticity, the liner becomes more or The upper end of milk hose It is slipped over a less stretched after it has been in use for a comnozzle m on a cupshaped member 1L, which is paratively short time, necessitating partial discarried by a ring o threaded on the outer shell lo assemblage" of the teat cup and readjustment of just below the shoulder d. y 70` the liner. This is not usually done skillfully and, Projecting from the outer shell b is a nozzle p moreover,` between adjustments, the liner pro which is adapted for connection with a source of gressively diminishes in eiciency In other pneumatic pulsations, whereby the space sur- Words, the factor of eiciency is necessarily varirounding the rubber liner h is subjected alter- 20, able, even with competent adjustments from time nately to atmosphericpressure and partial vaeu- 75 to time. v um. Through the milk hose lc the milk chamber The object of the invention is to provide means within the liner h of the teat cup is Vsubjected to a whereby .the stretch of the liner will be taken up constant partial vacuum. automatically and a proper tension maintained 'I'he tension of the springe is such as to main- 25,f on the liner at all times, thereby avoiding the tain the proper tension on the liner h. When in 80e i necessity for adjustment and maintaining the use, as the liner becomes somewhat stretched, the efficiency of the liner at an approximately conspring e expands and maintains proper tension on stant value. the liner.

The means that I have devised for accomplish- In actual operation, due to the alternate baling the last mentioned purpose also functions to ancing and unbalancing of pressure within the 85 impart to the liner a limited longitudinally recipteat cup with the pressure of the atmosphere rocating movement during milking, thereby Outside the teat cup, the outer shell b will have massaging the teat in such a manner as to create imparted to it a limited movement of longia condition which is highly favorable to securing tudinal reciprocation relative to the inner shell the maximum yield of milk from the cow. It is a, whereby the liner will be alternately longi- 902 Well known that the more agreeable the milking tudinally expanded and contracted to a slight operation is to the sensory system of the cow, the but substantial extent, thus imparting a masgreater the milk yield. The greater efciency of saging movement to the teat. It is found that my improved teat cup is believed to be explicable this action of the teat cup materially increases on this theory. the eiciency of the teat cup in that it milks The invention is susceptible of embodiment, in faster and cleaner. This result is believed to different forms, several of which are shown in the be due to the massaging action of the liner upon accompanying drawings, in whichthe teat, such action being wholly distinct from, Fig, 1 is a longitudinal section through a teat and additional to, the alternate compression and ycup embodying my invention. release of the teat which characterizes the op- 11.90

Figs. 2, 3 and 4 are similar views of modificaeration of the ordinary double chambered teat tions. cup.

In the construction shown in Fig. 1, the teat The IlVeIltOIl iS Capable 0f embOdmeIlt in cup casing comprises an inner shell a and an outer other OIDIS- In Fg- 2 the CODSTUCOII iS the `shell b. The inner shell is provided on its outer same as in Fig. 1 except that the liner h is inm5 wall with a number of longitudinally extending tegral with the milk tube 7c', the latter having ribs c, between which and an internal shoulder d a shoulder 1'. To secure the lower end of the on the outer shell is confined a coil spring e. liner in position, the milk tube 1c is drawn down Closing the annular space between the two shells through an orice in the bottom of shell b i Lat the upper end of the outer shell b is a rubber until the shoulder r is drawn through the ori- H9 ce, whereupon the pull on the tube 1c' is released and the shoulder snaps against the surface of the shell bottom surrounding and adjacent to said orice.

In Fig. 3, the invention is shown as embodied in a casing consisting of a longitudinally expansible and contractible spirally corrugated shell s, preferably of rubber, within which is conned or embedded a coil spring t. The oasing is contractible and expansible in length and the spring maintains the liner v under proper tension.

In Fig. 4, the outer shell 10 extends throughout the length of the teat cup. Within the outer shell is an inner shell 11 the bottom of which may comprise or carry a flanged disc 12 whose rim engages the inner wall of the outer shell l0. Between said shells is a coil spring 13. The spring is conned between said disc 12 and ears 14 secured to the inner wall of the outer shell 10. The liner 15 may be secured at its upper end as shown in Figs. 1 and 2. At its lower end it may be secured in xed relation to the disc 12 in the same way as, in Fig. 2, it is secured in xed relation with the bottom of outer shell b. In this construction the cylindrical part of shell l1 may be omitted, its main unction being a guide for the spring; the longitudinal contraction and expansion of the casing being effected by the movement of its bottom 12 relative to its cylindrical body 10.

What I claim and desire to protect by Letters Patent is: y

1. A teat cup comprising an outer longitudi nally expansible and contractible easing, a separate inner flexible and elastic liner secured at its opposite ends to said outer casing and enclosing an inner milk chamber adapted to be maintained under partial vacuum at different distances from the longitudinal axis of the teat cup and forming with the outer casing an enclosed chamber adapted to be subjected to pneumatic pulsations, means including a spring tending to expand the outer casing longitudinally and thereby maintain the liner under tension as it stretches in use, and means maintaining the spring out of contact with the liner when the latter expands radially, said parts being arranged to provide pneumatic pressure areas which are adapted, when the pulsation chamber is under low pressure, to be unbalanced and thereby longitudinally contract the outer casing against the action of the spring, whereby during the milking operation the teat will be subjected to a massaging action.

2. A teat cup comprising an outer casing comprising two parts which include two concentrically arranged members relatively movable longitudinally, an innei1 flexible and elastic liner whose opposite ends are connected with said parts respectively and which encloses an inner milk chamber adapted to be maintained under partial vacuum and forms with the outer casing an enclosed chamber adapted to be subjected to pneumatic pulsations, and a spring confined between said parts and tending to expand the liner longitudinally, said spring extending within the annular space between said concentrically arranged members the inner of which thereby maintains the teat when radially expanded out ci contact with the spring.

3. A teat cup comprising an outer casing comprising two parts relatively movable longitud nally, a spring operating on said parts and tending to expand the cup longitudinally, and an inner flexible and elastic liner secured at its upper end to one of said parts and at its lower end to the other of said parts at respectively 

